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Old 10-12-2013, 06:36 PM
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will 700r4 w/ 4.56 gears be to much

Well I finally got my heads to finish my 331 has promaxx 2151 vortec heads 30 over flat tops and lunati streetmaster 507 lift dur285. I know with the 331 I have to keep the rpms up to stay in the power band of that motor and I have the chance to buy a summit racing brand 700r4 with maybe 700 mile on it since it was installed and I was thing about running 4.56 posi behind it. I already know first gear would be short but should be fun to drive what do you guys think?

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Old 10-12-2013, 07:02 PM
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I think it would be an awesome choice and work great (as long as it's a nice beefed up trans).

I drive on the street with a T400 and 4.1 gears and I can cruise on the parkway no prob. With the OD and a 4.5 gear you'll be less RPMs than me. One of my very good friends has 4.5 gears in a Ford with 4R100 4 Speed Auto and we cruise the parkway all day long at very low RPM in OD
Do the math it's simple...

Engine RPM Calculator

Example 30" Tall Tires at 75 MPH with a 4.5 Gear is 2646 RPM
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Old 10-12-2013, 07:48 PM
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Its suppose to support up 400 or 450hp so it should hold up plus it going to be more of a cruiser then strip car but im gonna run it down the strip to see what it will run 1/8 track and maybe show out a little every now n then lol. Plus I'm thinking about installing a corvette servo and shift kit but I was told with the right servo I really don't need a shift kit, I'm new to the od trans all I know is the th350 that I've been beating on for 7year and still chirps the tires at will.
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Old 10-12-2013, 08:06 PM
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Quote:
Originally Posted by ProStreetRob View Post
I think it would be an awesome choice and work great (as long as it's a nice beefed up trans).

I drive on the street with a T400 and 4.1 gears and I can cruise on the parkway no prob. With the OD and a 4.5 gear you'll be less RPMs than me. One of my very good friends has 4.5 gears in a Ford with 4R100 4 Speed Auto and we cruise the parkway all day long at very low RPM in OD
Do the math it's simple...

Engine RPM Calculator

Example 30" Tall Tires at 75 MPH with a 4.5 Gear is 2646 RPM
Thanks ProStreetRob for the rpm calculator that's a great tool. With the od and that gear my highway rpm is way lower the a th350 and 3.73 combo which I've had in a 86mcss. Thanks again for the calculator.
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Old 10-13-2013, 06:51 AM
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The official math to determine Final RPM vs Gear & Tire Height is this...

MPH x (transmission final gear ratio) x (gear ration) x 336 Divided by (tire height)

I believe the 700r4 final ratio is .70 correct ? So as you see in your case and the example I used it works out to the tee

75 x .70 x 4.5 x 336 Divided by 30 = 2646 RPM

My Blown 502 with T400, 4.1, and big *** 33 x 21.5 tires at 75 MPH is this....

75 x 1.00 x 4.1 x 336 Divided by 33 = 3130 RPM
My 502 is a Solid Roller w/ Girdle and it'll rev 8500 all day long so parkway driving @ 3K is no problem

Some good reading here comparing the 4r100 to T350 & T400
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Old 10-13-2013, 12:05 PM
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Just be sure that you use a very good after market drive shaft with that combination. A stock drive shaft will not stay straight at the high RPMs that it will be turning at highway speeds. As the RPMs go up the drive shaft will begin to bow and cause a bad vibration. A drive shaft with about a 3 1/2 inch diameter and a thicker wall will probably be enough to handle the high RPMs. Contact a good drive shaft company like Driveline Parts: SFI Foundation, Driveshaft, Yoke, Universal Joint, Custom Driveshaft and ask for their opinion on what will be required.
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Old 10-13-2013, 07:42 PM
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The 4.56's are just right. You will need a 4000 stall converter with functional lock up too.
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Old 10-13-2013, 11:48 PM
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I'm not so sure that you will need a 4,000 stall converter...maybe if you were running it on the track all the time.

The high 2,000's - 2800 - 3000, will get you out of the hole plenty quick enough.
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Old 10-14-2013, 05:51 AM
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With a 3.06 first gear and a 4.56 rear gear why would you need anything more than a stock converter?
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Old 10-14-2013, 08:29 AM
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Why a 4ooo stall, Why anything? It sounds good to me.

It would be more torque multiplication right?

A majority of 3.5-4k converters only footbrake till 2400rpm. Most na built engines are barely organized at the rpm. He said to much, or too much..If you do it with a reasonable tire and chassis combo , it will be fine.
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Old 10-14-2013, 10:56 AM
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Gear head, thanks for mentioning the first gear ratio, I couldn't remember what that was. The ideal launch ratio is right around 12 to 1 for a street machine, so even a set of 4.10's would be more than enough. Plus it would keep the rotating mass down to a lower speed. Not to mention the fuel savings.
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Old 10-14-2013, 02:45 PM
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I have bout the same setup with 31" /4:56 , 700r4.
cheapy 12" 2500 converter. man its just to tight for me.
I need at least a 3000-3500 stall.

THE RACER
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Old 10-14-2013, 05:05 PM
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I guess that just goes to show that it's different strokes for different folks. Thanks for giving your side of the story.

I used to run a car with 4.56's, but with a Muncie M-22. I think first gear was something like 2.2 to 1. That only gave me 10.03 off the line. The earlier Muncies had a 2.5 something first, somewhat better.
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Old 10-14-2013, 05:46 PM
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The M20 has a 2.54 or 2.56 first gear, depending on when it was made. The M21 and M22 have a 2.20 first gear.
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Old 10-15-2013, 04:46 AM
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Quote:
Originally Posted by big gear head View Post
Just be sure that you use a very good after market drive shaft with that combination. A stock drive shaft will not stay straight at the high RPMs that it will be turning at highway speeds. As the RPMs go up the drive shaft will begin to bow and cause a bad vibration. A drive shaft with about a 3 1/2 inch diameter and a thicker wall will probably be enough to handle the high RPMs. Contact a good drive shaft company like Driveline Parts: SFI Foundation, Driveshaft, Yoke, Universal Joint, Custom Driveshaft and ask for their opinion on what will be required.
Well big gear head I already have farely large drive shaft in it from the truck my th350 came from and its a lot bigger then th standard gbody drive shaft that came in the car and I will be running a torque converter in the 2500 to 2800 rpm range specified by my cam specs and thanks for all the info from everybody.
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